Turn off the power to the microwave from the circuit breaker.
Open the microwave oven door. Insert the screwdriver into the four screws in each corner of the inside of the microwave door and remove these screws by turning the screwdriver to the left. Set the screws on the inside.
Pry and pull out the inside panel of the Spacemaker's door and set it on the side. This will allow access to the door handle screws.
Remove the two screws that hold the door handle in place with the screwdriver. Set the new handle in place, aligning the screw holes carefully. Insert the door holder screws and tighten them down with the screwdriver.
Place the inner door panel back into place, insert the panel's retaining screws and tighten them down with the screwdriver.
Turn the power back on to the Spacemaker from the breaker box.